POWER OVER ETHERNET PORT PROTECTION CIRCUIT AND ETHERNET POWER SUPPLY EQUIPMENT

摘要

The present invention discloses a protection circuit of Power Over Ethernet (POE) port and an Ethernet power-sourcing equipment. The port protection circuit includes: a first common mode suppression component, a second common mode suppression component, and m rectifier bridges, where m is equal to the number of ports and the rectifier bridges are in one-to-one correspondence with the ports. A first input end and a second input end of each rectifier bridge are connected to a first direct current output end and a second direct current output end of a power over Ethernet PoE control chip, respectively. A first output end or a second output end of each rectifier bridge is connected to an idle signal line of a corresponding port, where the idle signal line is an uncharged signal line. An end of the first common mode suppression component is connected to the first output end of each rectifier bridge, and another end thereof is grounded. An end of the second common mode suppression component is connected to the second output end of each rectifier bridge, and another end thereof is grounded. In the present invention, the problem that a common mode overvoltage is converted into a differential mode overvoltage due to inconsistent actions of protection components in the prior art can be effectively solved and safety is good.